Take accessToken from context in signalfxexporter #49230

Job	Run time
collector-build	6m 39s
docker-build	6m 53s
supervisor-test	53s
kubernetes-test-matrix (v1.30.0, receiver/k8sclusterreceiver)	6m 37s
kubernetes-test-matrix (v1.30.0, processor/k8sattributesprocessor)	6m 23s
kubernetes-test-matrix (v1.30.0, receiver/kubeletstatsreceiver)	4m 3s
kubernetes-test-matrix (v1.30.0, receiver/k8sobjectsreceiver)	3m 13s
kubernetes-test-matrix (v1.23.17, receiver/k8sclusterreceiver)	6m 37s
kubernetes-test-matrix (v1.23.17, processor/k8sattributesprocessor)	6m 40s
kubernetes-test-matrix (v1.23.17, receiver/kubeletstatsreceiver)	4m 2s
kubernetes-test-matrix (v1.23.17, receiver/k8sobjectsreceiver)	3m 19s
kubernetes-test	1s
	55m 20s

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